but during simming, spot plane view is great, thanks to a tweak to the fsx.cfg file (set affinitymask=12). before the Jobscheduler tweak I was getting really bad jerkiness in Spot Plane View during simming. Is there a fix for IR SP jerkiness?

Yup, use 'locked spot' instead, and then fake the camera movement in post-processing by enlarging the clip slightly to give you a bit of movement play, then shift the frame about in your video editing software to simulate the camera movement.Al